Synthesis, spectral and cyclic voltammetric studies of some Ru(III) complexes of azo dyes derived from 4-aminoantipyrine

Some novel complexes of an azo dye 2,3-dimethyl-1-phenyl-4-(2-hydroxynaphthylazo)pyrazol-5-one (naphtholazoantipyrine NAAPH) derived from 4-aminoantipyrine with Ru(III) have been prepared and characterized using elemental analysis, magnetic moment and conductance measurements and infrared, electronic and ESR spectroscopic techniques. The electrochemical behaviour of the complex is followed using cyclic voltammetry and it is seen that the metal-ligand linkage is more covalent in nature. The ESR spectrum of the complex [RuCl3(PPh3)NAAPH) exhibited a single line with 'g' value of 2.39, indicating high symmetry around ruthenium ion. The complexes are found to be neutral with an octahedral geometry.